All Wheels Manufacturing replacement derailleur hangers are produced in their Colorado shop to exacting tolerances. - CNC machined 6061 aluminum - Black anodized finish - Includes (3) M3x8 Flat Head Screws - Specialized Part #9890-4226 Note: This hanger has been updated to match Specialized Part #9890-4226 and will accommodate 28-tooth and larger cassette cogs. Shifting with smaller cassette cog ranges will not be adversely affected.